Ответ:

[tex]1)x = 5.2 \\ 2)43.53[/tex]

Пошаговое объяснение:

[tex]1)(7.8 - x) \ast 4.3 = 11.18 \\ 33.54 \ast 4.3x = 11.8 \\ -4 x = 11.18 - 33.54 \\ - 4.3x = - 22.36 \\ x = - 22.36 \div ( - 4.3) \\ x = 5.2[/tex]

[tex]2)(x + 16.31) \div 35.2 = 1.7 \\ (x + \frac{1631}{100} ) \div \frac{176}{5} = \frac{17}{10} \\ (x + \frac{1631}{100} ) \ast \frac{5}{176} = \frac{17}{10} \\ \frac{5}{176} x + \frac{1631}{3520} = \frac{17}{10} \\ 100x + 1631 = 5984 \\ 100x = 5984 - 1631 \\ 100x = 4353 \\ x = 4353 \div 100 \\ x = 43.53[/tex]

Или

[tex] \frac{4353}{100} [/tex]